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Hi

In the article - Arduino Uno SPWM Inverter,
https://yopiediy.xyz/
https://yopiediy.xyz/arduino-uno-invert ... sine-wave/
Author used Timer1 to create the SPWM by using one Lut (table).
The Time1 code:
TCCR1A = 0b10110000;
/* 0b10xxxxxx Clear OC1A/OC1B on compare match when up-counting. Set on compare match when down counting
0bxx11xxxx Set OC1A/OC1B on compare match when up-counting. Clear on compare match when down counting.
0bxxxxxx00 WGM1 1:0 for waveform 8 (phase freq. correct). */
TCCR1B = 0b00010001;
/* 000xxxxx
xxx10xxx WGM1 3:2 for waveform mode 8.
xxxxx001 no prescale on the counter.
*/
TIMSK1 = 0b00000001;
/* xxxxxxx1 TOV1 Flag interrupt enable. */
ICR1 = 800; /* Counter TOP value (at 16MHz XTAL, SPWM carrier freq. 10kHz, 200 samples/cycle).*/
sei(); /* Enable global interrupts.*/
DDRB = 0b00011110; /* Pin 9, 10, 11, 12 as outputs.*/

Question
How can I set the custom code for Timer1 (in Nano)?
PS
I found one example (attached), fixed by Ben years ago.
Would be great if somebody can help me.
Thanks

Have tried the next code, but due to my C-code errors, it does not work

I am not sure where should be the interrupt title in this code...
ISR(TIMER1_CAPT_vect) // input capture vector
{
FCM_%n(); // Call Flowcode Macro
}

Doesn't look like interrupt calls the Timer1 macro

See viewtopic.php?p=107449#p107449 - where I posted an Arduino PW sine wave chart..

Might do what you need?

Martin

Hi Martin
The ATmega328 Timer1 can be configured (if directly accessed) into the Phase Correct Pulse Width Modulator (PWM) mode.
So far I have problems with the custom code for Timer1
TCCR1A = 0b10110000;
/* 10xxxxxx Clear OC1A/OC1B on compare match when up-counting. Set OC1A/OC1B on compare match when down counting
xx11xxxx Set OC1A/OC1B on compare match when up-counting. Clear OC1A/OC1B on compare match when down counting.
xxxxxx00 WGM1 1:0 for waveform 8 (phase freq. correct).
*/
TCCR1B = 0b00010001;
/* 000xxxxx
xxx10xxx WGM1 3:2 for waveform mode 8.
xxxxx001 no prescale on the counter.
*/
TIMSK1 = 0b00000001;
/* xxxxxxx1 TOV1 Flag interrupt enable. */
ICR1 = 800; /* Counter TOP value (at 16MHz XTAL, SPWM carrier freq. 10kHz, 200 samples/cycle).*/
sei(); /* Enable global interrupts.*/
DDRB = 0b00011110;